Workaround QWebEnginePage not scrolling to anchors when opened in background tab

Closes #2242

src/lib/webengine/webpage.cpp

@@ -90,6 +90,16 @@ WebPage::WebPage(QObject* parent)
     connect(this, &QWebEnginePage::proxyAuthenticationRequired, this, [this](const QUrl &, QAuthenticator *auth, const QString &proxyHost) {
         mApp->networkManager()->proxyAuthentication(proxyHost, auth, view());
     });
+
+    // Workaround QWebEnginePage not scrolling to anchors when opened in background tab
+    m_contentsResizedConnection = connect(this, &QWebEnginePage::contentsSizeChanged, this, [this]() {
+        const QString fragment = url().fragment();
+        if (!fragment.isEmpty()) {
+            const QString src = QSL("var els = document.querySelectorAll(\"[name='%1']\"); if (els.length) els[0].scrollIntoView();");
+            runJavaScript(src.arg(fragment));
+        }
+        disconnect(m_contentsResizedConnection);
+    });
 }
 
 WebPage::~WebPage()

src/lib/webengine/webpage.h

@@ -1,6 +1,6 @@
 /* ============================================================
-* QupZilla - WebKit based browser
-* Copyright (C) 2010-2016 David Rosca <nowrep@gmail.com>
+* QupZilla - Qt web browser
+* Copyright (C) 2010-2017 David Rosca <nowrep@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
@@ -115,6 +115,8 @@ private:
     bool m_blockAlerts;
     bool m_secureStatus;
     bool m_adjustingScheduled;
+
+    QMetaObject::Connection m_contentsResizedConnection;
 };
 
 #endif // WEBPAGE_H